Answer:200b-3000
Explanation:
Let 
 be the number of boats the boat house dock.
 be the number of boats the boat house dock.
It is given that the boat house spends $
 and charges $
 and charges $
 for each boat.
 for each boat.
Let 
 be the profit associate with each boat.
 be the profit associate with each boat.
So,profit associated with each boat=


It is also given that there exist a fixed cost of $
 for a month.
 for a month.
So,the net profit is 

